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Question
Which of the following chemical reactions is reversible?
Options:
A .  CH4 + O2 ⇌ CO2 + H2O
B .  CuSO4.5H2O → CuSO4 + 5H2O
C .  NH4Cl ⇌ NH3 + HCl
D .  CaCO3 → CaO +CO2
Answer: Option C

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